dart2js: capture type variables in closures, if they are only used in literals.

pkg/compiler/lib/src/closure.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library closureToClassMapper;
 
 import "elements/elements.dart";
 import "dart2jslib.dart";
 import "dart_types.dart";
 import "js_backend/js_backend.dart" show JavaScriptBackend;
@@ skipping 713 matching lines @@
     }
     super.visitSendSet(node);
   }
 
   visitNewExpression(NewExpression node) {
     DartType type = elements.getType(node);
     analyzeType(type);
     node.visitChildren(this);
   }
 
+  visitLiteralList(LiteralList node) {
+    DartType type = elements.getType(node);
+    analyzeType(type);
+    node.visitChildren(this);
+  }
+
+  visitLiteralMap(LiteralMap node) {
+    DartType type = elements.getType(node);
+    analyzeType(type);
+    node.visitChildren(this);
+  }
+
   void analyzeTypeVariables(DartType type) {
     type.forEachTypeVariable((TypeVariableType typeVariable) {
       // Field initializers are inlined and access the type variable as
       // normal parameters.
       if (!outermostElement.isField &&
           !outermostElement.isConstructor) {
         registerNeedsThis();
       } else {
         useTypeVariableAsLocal(typeVariable);
       }
@@ skipping 271 matching lines @@
 
   String get name => typeVariable.name;
 
   int get hashCode => typeVariable.hashCode;
 
   bool operator ==(other) {
     if (other is! TypeVariableLocal) return false;
     return typeVariable == other.typeVariable;
   }
 }